text: Airlines around the world are distinguished from each other by price, service, type of aircraft, and a number of other criteria?
classes:  No, passengers can easily distinguish the airlines of the world from each other thanks to the criteria that have been set out.  Also, passengers can easily distinguish the airlines of the world from each other thanks to the criteria that have been set out.  Yes, passengers can easily distinguish the airlines of the world from each other thanks to the criteria that have been set out.